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spayn [35]
3 years ago
10

Overall, how has science impacted human health?

Biology
1 answer:
mixas84 [53]3 years ago
8 0

Answer:

The correct answer is: <em>C. Increased average lifespan to 78 in the US.</em>

Explanation:

Science has impacted human health by increasing the average lifespan to 78 in the US. Over the last couple of decades, the life expectancy of Americans has increased significantly than what it was 200 years ago. This can be attributed to:

1. Vaccinations- Since the invention of vaccinations, diseases such as tuberculosis, cholera and polio which were major causes of death 200 years ago have virtually been eradicated in the US.

2. Abundant and safer foods available- Commercial and large scale farming has made a wide variety of nutritious foods easier to obtain.

3. Improved sanitation- Safer drinking water, sewage treatment and stricter food inspection has significantly reduced the rate of illnesses due to poor hygiene and sanitation.  

In these ways, science has impacted human health by increasing the average lifespan to 78 in the US.

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In garden peas, the yellow seed trait is dominant over green seeds. Also, the round seed trait is dominant over the wrinkled-see
Darina [25.2K]

Answer:

405 individuals will be yellow and round seeded.

Explanation:

<u>Available data:</u>

  • the yellow seed trait is dominant over green seeds
  • round seed trait is dominant over the wrinkled-seed trait
  • These genes are on separate chromosomes

Let´s name the seed color genes Y, and the seed shape gene R

  • Y is the dominant allele for seed color expressing yellow
  • y is the recessive allele for seed color expressing green
  • R is the dominant allele for seed shape expressing round
  • r is the recessive allele for seed shape expressing wrinkled

Cross: between two plants that are heterozygous for both traits

Parental)       Yy Rr            x       Yy Rr

Gametes) YR   yR   Yr   yr   YR   yR   Yr   yr

Punnet Square)   YR         yR         Yr         yr

                YR     YYRR     YyRR     YYRr    YyRr

                yR      YyRR      yyRR     YyRr     yyRr

                Yr       YYRr      YyRr      YYrr     Yyrr

                yr        YyRr       yyRr      Yyrr      yyrr

F1) 720 individuals

    9/16 yellow and round seeded individuals, Y-R-

    3/16 green and round seeded individuals, yyR-

    3/16 yellow and wrinkle seeded individuals, Y-rr

    1/16 green and wrinkle seeded individuals, yyrr

<em>Note: the "-" symbol in the phenotypes means that there it could be either a dominant or recessive allele. </em>

If 720 is the total number of individuals in the F1, then:

16 possible genotypes ---------- 100% of the progeny -------- 720 individuals

9 yellow and rounded----------- 56.25% ----------------------------405 individuals

3 green and rounded-------------18.75%------------------------------135 individuals

3 yellow and wrinkled-------------18.75%------------------------------135 individuals

1 green and wrinkled--------------6.25%-------------------------------45 individuals

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Bacteria reproduce through binary fission. Binary fission is a simpler process than mitosis in plants and animals because bacter
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This is because bacteria are single-celled organisms.As opposed to animals and plants, which are multicellular organisms, bacteria are not - they consist of one cell only. This is what makes the entire process of binary fission much simpler than mitosis in plants and animals - because of the number of cells these organisms contain.

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